Author Topic: charging non-rechargable battery under a circuit failure, risk of fire?  (Read 517 times)

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Offline diegopmTopic starter

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Hi,

I have a system that is powered by two redundant power supplies, 12V from a commercial adapter and 9V from a non-rechargeable battery. This is managed by an ORing circuit of Schottky diodes that has an inverse current of several uA depending of temperature.

I have two questions:

  • What happens to non-rechargeable battery if a small current pumped in (charging at several uA along the time)?
  • What happens to non-rechargeable battery if my circuit has an unusual problem (short circuit, free cable touching parts, user manipulation, short circuit in ORing element, etc.) that put 12V to 9V battery for a long time?

I am concerned about risk of fire or explosion if a high charge current is applied (as manufacturers says in datasheet). Or a liquid leakage if a tiny charge is applied due to inverse current of the diode.


Thanks and best regards.
 

Offline wizard69

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If you have a fear of circuit failure then it would make sense to me to fuse the circuit to the battery at the very least.

As for batteries leaking if you are talking alkaline I really don't see anyway to positively prevent premature failure of these sorts of batteries.   It has gotten so that I'm not even willing to buy such anymore due to all the damaged hardware i've had due to the infernal leakage.   

I actually thought I could out smart the leaking battery problem by running around and changing all batteries on my birthday every year.    That didn't work!       So now I look for solutions other than alkaline batteries.

Now that that rant is over I have to wonder just what type of battery are you using?    Some are more prone to fire than others.   If this is a critical application it would probably be best to consult with the battery manufacture.
 

Offline David Hess

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UL has requirements for this sort of thing.  At low currents, nothing bad happens.  Typically two diodes in series are required in case one shorts and a series resistor should be included with a value consistent with the expected current draw.
 


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